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Capital Stock and Long-term Retention Plan - Long-Term Retention Plan (Details)
EquityInstruments in Thousands, $ in Thousands, shares in Millions
3 Months Ended 12 Months Ended
Apr. 02, 2013
Dec. 31, 2020
MXN ($)
EquityInstruments
Sep. 30, 2020
MXN ($)
Dec. 31, 2019
EquityInstruments
MXN ($)
Dec. 31, 2020
EquityInstruments
$ / shares
Dec. 31, 2019
EquityInstruments
Dec. 31, 2018
EquityInstruments
Dec. 31, 2020
MXN ($)
Dec. 31, 2020
shares
Jun. 30, 2020
shares
Long-Term Retention Plan                    
Share based payment arrangements                    
Maximum percentage of capital granted annually in CPOs 1.50%                  
Shares sold in open market                 10.0  
Shares vested | $       4,745,300            
Cash contributions to the trust held for Long-Term Retention Plan | $   $ 197,000                
Number of other equity instruments forfeited in share-based payment arrangement | $       9,490,500            
Number of shares held in connection of with cancellation of shares                   5,526.3
Number of shares held in connection of with forfeited rights                 3,196.1 1,009.7
Refund for decrease to the balance of shares repurchased | $     $ 100,000              
Funding made for acquisition of shares | $   $ 197,000                
Retention Plan Trust                    
Share based payment arrangements                    
Percentage of CPOs or its equivalents held in the form of CPO by trust         76.50%          
Percentage of CPOs or its equivalents held in the form other than CPO by trust         23.50%          
Number reserved for future vesting                 137.0  
Vesting price (in pesos per CPO) | $ / shares         $ 36.52          
Number of CPOs owned by trust for employees                 0.8  
Series "A" Shares | Long-Term Retention Plan                    
Share based payment arrangements                    
Number of shares held in connection of with cancellation of shares                   666.9
Number of shares held in connection of with forfeited rights                 351.0  
CPOs | Long-Term Retention Plan                    
Share based payment arrangements                    
Shares outstanding | EquityInstruments   160,365   243,472 160,365 243,472 179,051      
Shares vested | EquityInstruments           3,107        
Number of other equity instruments forfeited in share-based payment arrangement | EquityInstruments         122,307 5,030        
Number of other equity instruments held in connection of with cancellation of shares                   47.2
Number of other equity instruments held in connection of with forfeited rights                 27.4 8.6
CPOs | Retention Plan Trust                    
Share based payment arrangements                    
Shares outstanding   223,400     223,400     223,400    
Shares vested | EquityInstruments         4,400 32,300 34,300      
Minimum | Long-Term Retention Plan                    
Share based payment arrangements                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term       2 years            
Minimum | Retention Plan Trust                    
Share based payment arrangements                    
Vesting price (in pesos per CPO) | $ / shares         $ 52.05          
Maximum | Long-Term Retention Plan                    
Share based payment arrangements                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term       3 years            
Maximum | Retention Plan Trust                    
Share based payment arrangements                    
Vesting price (in pesos per CPO) | $ / shares         $ 1.60